E
tags: String, Basic Implementation

```

/**
Given a valid (IPv4) IP address, return a defanged version of that IP address.

A defanged IP address replaces every period "." with "[.]".

 

Example 1:

Input: address = "1.1.1.1"
Output: "1[.]1[.]1[.]1"
Example 2:

Input: address = "255.100.50.0"
Output: "255[.]100[.]50[.]0"
*/
class Solution {
    public String defangIPaddr(String address) {
        StringBuffer sb = new StringBuffer();
        for (char c : address.toCharArray()) {
            if (c == '.') {
                sb.append("[.]");
            } else {
                sb.append(c);
            }
        }
        return sb.toString();
    }
}
```